-public class ShardManager extends AbstractUntypedPersistentActorWithMetering {
-
- private final Logger LOG = LoggerFactory.getLogger(getClass());
-
- // Stores a mapping between a member name and the address of the member
- // Member names look like "member-1", "member-2" etc and are as specified
- // in configuration
- private final Map<String, Address> memberNameToAddress = new HashMap<>();
-
- // Stores a mapping between a shard name and it's corresponding information
- // Shard names look like inventory, topology etc and are as specified in
- // configuration
- private final Map<String, ShardInformation> localShards = new HashMap<>();
-
- // The type of a ShardManager reflects the type of the datastore itself
- // A data store could be of type config/operational
- private final String type;
-
- private final ClusterWrapper cluster;
-
- private final Configuration configuration;
-
- private final String shardDispatcherPath;
-
- private ShardManagerInfo mBean;
-
- private DatastoreContext datastoreContext;
-
- private Collection<String> knownModules = Collections.emptySet();
-
- private final DataPersistenceProvider dataPersistenceProvider;
-
- private final CountDownLatch waitTillReadyCountdownLatch;
-
- /**
- */
- protected ShardManager(ClusterWrapper cluster, Configuration configuration,
- DatastoreContext datastoreContext, CountDownLatch waitTillReadyCountdownLatch) {
-
- this.cluster = Preconditions.checkNotNull(cluster, "cluster should not be null");
- this.configuration = Preconditions.checkNotNull(configuration, "configuration should not be null");
- this.datastoreContext = datastoreContext;
- this.dataPersistenceProvider = createDataPersistenceProvider(datastoreContext.isPersistent());
- this.type = datastoreContext.getDataStoreType();
- this.shardDispatcherPath =
- new Dispatchers(context().system().dispatchers()).getDispatcherPath(Dispatchers.DispatcherType.Shard);
- this.waitTillReadyCountdownLatch = waitTillReadyCountdownLatch;
-
- // Subscribe this actor to cluster member events
- cluster.subscribeToMemberEvents(getSelf());
-
- createLocalShards();
- }
-
- protected DataPersistenceProvider createDataPersistenceProvider(boolean persistent) {
- return (persistent) ? new PersistentDataProvider() : new NonPersistentDataProvider();
- }
-
- public static Props props(
- final ClusterWrapper cluster,
- final Configuration configuration,
- final DatastoreContext datastoreContext,
- final CountDownLatch waitTillReadyCountdownLatch) {
-
- Preconditions.checkNotNull(cluster, "cluster should not be null");
- Preconditions.checkNotNull(configuration, "configuration should not be null");
- Preconditions.checkNotNull(waitTillReadyCountdownLatch, "waitTillReadyCountdownLatch should not be null");
-
- return Props.create(new ShardManagerCreator(cluster, configuration, datastoreContext, waitTillReadyCountdownLatch));
- }
-
- @Override
- public void postStop() {
- LOG.info("Stopping ShardManager");
-
- mBean.unregisterMBean();
- }
-
- @Override
- public void handleCommand(Object message) throws Exception {
- if (FindPrimary.SERIALIZABLE_CLASS.isInstance(message)) {
- findPrimary(FindPrimary.fromSerializable(message));
- } else if(message instanceof FindLocalShard){
- findLocalShard((FindLocalShard) message);
- } else if (message instanceof UpdateSchemaContext) {
- updateSchemaContext(message);
- } else if(message instanceof ActorInitialized) {
- onActorInitialized(message);
- } else if (message instanceof ClusterEvent.MemberUp){
- memberUp((ClusterEvent.MemberUp) message);
- } else if(message instanceof ClusterEvent.MemberRemoved) {
- memberRemoved((ClusterEvent.MemberRemoved) message);
- } else if(message instanceof ClusterEvent.UnreachableMember) {
- ignoreMessage(message);
- } else if(message instanceof DatastoreContext) {
- onDatastoreContext((DatastoreContext)message);
- } else if(message instanceof RoleChangeNotification) {
- onRoleChangeNotification((RoleChangeNotification) message);
- } else if(message instanceof FollowerInitialSyncUpStatus){
- onFollowerInitialSyncStatus((FollowerInitialSyncUpStatus) message);
- } else{
- unknownMessage(message);
- }
-
- }
-
- private void onFollowerInitialSyncStatus(FollowerInitialSyncUpStatus status) {
- LOG.info("Received follower initial sync status for {} status sync done {}", status.getName(),
- status.isInitialSyncDone());
-
- ShardInformation shardInformation = findShardInformation(status.getName());
-
- if(shardInformation != null) {
- shardInformation.setFollowerSyncStatus(status.isInitialSyncDone());
-
- mBean.setSyncStatus(isInSync());
- }
-
- }
-
- private void onRoleChangeNotification(RoleChangeNotification roleChanged) {
- LOG.info("Received role changed for {} from {} to {}", roleChanged.getMemberId(),
- roleChanged.getOldRole(), roleChanged.getNewRole());
-
- ShardInformation shardInformation = findShardInformation(roleChanged.getMemberId());
- if(shardInformation != null) {
- shardInformation.setRole(roleChanged.getNewRole());
-
- if (isReady()) {
- LOG.info("All Shards are ready - data store {} is ready, available count is {}", type,
- waitTillReadyCountdownLatch.getCount());
-
- waitTillReadyCountdownLatch.countDown();
- }
-
- mBean.setSyncStatus(isInSync());
- }
- }
-
-
- private ShardInformation findShardInformation(String memberId) {
- for(ShardInformation info : localShards.values()){
- if(info.getShardId().toString().equals(memberId)){
- return info;
- }
- }
-
- return null;
- }
-
- private boolean isReady() {
- boolean isReady = true;
- for (ShardInformation info : localShards.values()) {
- if(RaftState.Candidate.name().equals(info.getRole()) || Strings.isNullOrEmpty(info.getRole())){
- isReady = false;
- break;
- }
- }
- return isReady;
- }
-
- private boolean isInSync(){
- for (ShardInformation info : localShards.values()) {
- if(!info.isInSync()){
- return false;
- }
- }
- return true;
- }
-
- private void onActorInitialized(Object message) {
- final ActorRef sender = getSender();
-
- if (sender == null) {
- return; //why is a non-actor sending this message? Just ignore.
- }
-
- String actorName = sender.path().name();
- //find shard name from actor name; actor name is stringified shardId
- ShardIdentifier shardId = ShardIdentifier.builder().fromShardIdString(actorName).build();
-
- if (shardId.getShardName() == null) {
- return;
- }
- markShardAsInitialized(shardId.getShardName());
- }
-
- private void markShardAsInitialized(String shardName) {
- LOG.debug("Initializing shard [{}]", shardName);
- ShardInformation shardInformation = localShards.get(shardName);
- if (shardInformation != null) {
- shardInformation.setActorInitialized();
- }
- }
-
- @Override
- protected void handleRecover(Object message) throws Exception {
- if(dataPersistenceProvider.isRecoveryApplicable()) {
- if (message instanceof SchemaContextModules) {
- SchemaContextModules msg = (SchemaContextModules) message;
- knownModules = ImmutableSet.copyOf(msg.getModules());
- } else if (message instanceof RecoveryFailure) {
- RecoveryFailure failure = (RecoveryFailure) message;
- LOG.error("Recovery failed", failure.cause());
- } else if (message instanceof RecoveryCompleted) {
- LOG.info("Recovery complete : {}", persistenceId());
-
- // Delete all the messages from the akka journal except the last one
- deleteMessages(lastSequenceNr() - 1);
- }
- } else {
- if (message instanceof RecoveryCompleted) {
- LOG.info("Recovery complete : {}", persistenceId());
-
- // Delete all the messages from the akka journal
- deleteMessages(lastSequenceNr());
- }
- }
- }
-
- private void findLocalShard(FindLocalShard message) {
- final ShardInformation shardInformation = localShards.get(message.getShardName());
-
- if(shardInformation == null){
- getSender().tell(new LocalShardNotFound(message.getShardName()), getSelf());
- return;
- }
-
- sendResponse(shardInformation, message.isWaitUntilInitialized(), new Supplier<Object>() {
- @Override
- public Object get() {
- return new LocalShardFound(shardInformation.getActor());
- }
- });
- }
-
- private void sendResponse(ShardInformation shardInformation, boolean waitUntilInitialized,
- final Supplier<Object> messageSupplier) {
- if (!shardInformation.isShardInitialized()) {
- if(waitUntilInitialized) {
- final ActorRef sender = getSender();
- final ActorRef self = self();
- shardInformation.addRunnableOnInitialized(new Runnable() {
- @Override
- public void run() {
- sender.tell(messageSupplier.get(), self);
- }
- });
- } else {
- getSender().tell(new ActorNotInitialized(), getSelf());
- }
-
- return;
- }
-
- getSender().tell(messageSupplier.get(), getSelf());
- }
-
- private void memberRemoved(ClusterEvent.MemberRemoved message) {
- memberNameToAddress.remove(message.member().roles().head());
- }
-
- private void memberUp(ClusterEvent.MemberUp message) {
- String memberName = message.member().roles().head();
-
- memberNameToAddress.put(memberName, message.member().address());
-
- for(ShardInformation info : localShards.values()){
- String shardName = info.getShardName();
- info.updatePeerAddress(getShardIdentifier(memberName, shardName),
- getShardActorPath(shardName, memberName));
- }
- }
-
- private void onDatastoreContext(DatastoreContext context) {
- datastoreContext = context;
- for (ShardInformation info : localShards.values()) {
- if (info.getActor() != null) {
- info.getActor().tell(datastoreContext, getSelf());
- }
- }
- }
-
- /**
- * Notifies all the local shards of a change in the schema context
- *
- * @param message
- */
- private void updateSchemaContext(final Object message) {
- final SchemaContext schemaContext = ((UpdateSchemaContext) message).getSchemaContext();
-
- Set<ModuleIdentifier> allModuleIdentifiers = schemaContext.getAllModuleIdentifiers();
- Set<String> newModules = new HashSet<>(128);
-
- for(ModuleIdentifier moduleIdentifier : allModuleIdentifiers){
- String s = moduleIdentifier.getNamespace().toString();
- newModules.add(s);
- }
-
- if(newModules.containsAll(knownModules)) {
-
- LOG.debug("New SchemaContext has a super set of current knownModules - persisting info");
-
- knownModules = ImmutableSet.copyOf(newModules);
-
- dataPersistenceProvider.persist(new SchemaContextModules(newModules), new Procedure<SchemaContextModules>() {
-
- @Override
- public void apply(SchemaContextModules param) throws Exception {
- LOG.debug("Sending new SchemaContext to Shards");
- for (ShardInformation info : localShards.values()) {
- if (info.getActor() == null) {
- info.setActor(getContext().actorOf(Shard.props(info.getShardId(),
- info.getPeerAddresses(), datastoreContext, schemaContext)
- .withDispatcher(shardDispatcherPath), info.getShardId().toString()));
- } else {
- info.getActor().tell(message, getSelf());
- }
- info.getActor().tell(new RegisterRoleChangeListener(), self());
- }
- }
-
- });
- } else {
- LOG.debug("Rejecting schema context update - not a super set of previously known modules:\nUPDATE: {}\nKNOWN: {}",
- newModules, knownModules);
- }
-
- }
-
- private void findPrimary(FindPrimary message) {
- String shardName = message.getShardName();
-
- // First see if the there is a local replica for the shard
- final ShardInformation info = localShards.get(shardName);
- if (info != null) {
- sendResponse(info, message.isWaitUntilInitialized(), new Supplier<Object>() {
- @Override
- public Object get() {
- return new PrimaryFound(info.getActorPath().toString()).toSerializable();
- }
- });
-
- return;
- }
-
- List<String> members = configuration.getMembersFromShardName(shardName);
-
- if(cluster.getCurrentMemberName() != null) {
- members.remove(cluster.getCurrentMemberName());
- }
-
- /**
- * FIXME: Instead of sending remote shard actor path back to sender,
- * forward FindPrimary message to remote shard manager
- */
- // There is no way for us to figure out the primary (for now) so assume
- // that one of the remote nodes is a primary
- for(String memberName : members) {
- Address address = memberNameToAddress.get(memberName);
- if(address != null){
- String path =
- getShardActorPath(shardName, memberName);
- getSender().tell(new PrimaryFound(path).toSerializable(), getSelf());
- return;
- }
- }
- getSender().tell(new PrimaryNotFound(shardName).toSerializable(), getSelf());
- }
-
- private String getShardActorPath(String shardName, String memberName) {
- Address address = memberNameToAddress.get(memberName);
- if(address != null) {
- StringBuilder builder = new StringBuilder();
- builder.append(address.toString())
- .append("/user/")
- .append(ShardManagerIdentifier.builder().type(type).build().toString())
- .append("/")
- .append(getShardIdentifier(memberName, shardName));
- return builder.toString();
- }
- return null;
- }
-
- /**
- * Construct the name of the shard actor given the name of the member on
- * which the shard resides and the name of the shard
- *
- * @param memberName
- * @param shardName
- * @return
- */
- private ShardIdentifier getShardIdentifier(String memberName, String shardName){
- return ShardIdentifier.builder().memberName(memberName).shardName(shardName).type(type).build();
- }
-
- /**
- * Create shards that are local to the member on which the ShardManager
- * runs
- *
- */
- private void createLocalShards() {
- String memberName = this.cluster.getCurrentMemberName();
- List<String> memberShardNames =
- this.configuration.getMemberShardNames(memberName);
-
- List<String> localShardActorNames = new ArrayList<>();
- for(String shardName : memberShardNames){
- ShardIdentifier shardId = getShardIdentifier(memberName, shardName);
- Map<ShardIdentifier, String> peerAddresses = getPeerAddresses(shardName);
- localShardActorNames.add(shardId.toString());
- localShards.put(shardName, new ShardInformation(shardName, shardId, peerAddresses));
- }
-
- mBean = ShardManagerInfo.createShardManagerMBean("shard-manager-" + this.type,
- datastoreContext.getDataStoreMXBeanType(), localShardActorNames);
- }
-